A.T. Robertson Commentary Ephesians 4:3

"giving diligence to keep the unity of the Spirit in the bond of peace." — Ephesians 4:3 (ASV)

The unity (την ενοτητα). Late and rare word (from εις, one), in Aristotle and Plutarch, though in N.T. only here and verse 13.

In the bond of peace (εν τω συνδεσμω της ειρηνης). In Col 3:14 αγαπη (love) is the συνδεσμος (bond). But there is no peace without love (verse 2).